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New Lithium Measurements in Metal-Poor Stars

Marc Schaeuble and Jeremy R. King
Publications of the Astronomical Society of the Pacific
Vol. 124, No. 912 (February 2012), pp. 164-172
DOI: 10.1086/664618
Stable URL: http://www.jstor.org/stable/10.1086/664618
Page Count: 9
Subjects: Astronomy
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New Lithium Measurements in Metal-Poor Stars
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Abstract

ABSTRACT.We provide λ6708 Li i measurements in 37 metal-poor stars, most of which are poorly studied or have no previous measurements, from high-resolution and high-S/N spectroscopy obtained with the McDonald Observatory 2.1 m and 2.7 m telescopes. The typical line-strength and abundance uncertainties, confirmed by the thinness of the Spite plateau manifested by our data and by comparison with previous measurements, are ≤ 4 mÅ≤4  mÅ and ≤ 0.07–0.10 dex≤0.07–0.10  dex, respectively. Two rare moderately metal-poor solar-TeffTeff dwarfs, HIP 36491 and 40613, with significantly depleted but still detectable Li are identified; future light-element determinations in the more heavily depleted HIP 40613 may provide constraints on the Li depletion mechanism acting in this star. We note two moderately metal-poor and slightly evolved stars, HIP 105888 and G265-39, that appear to be analogs of the low-Li moderately metal-poor subgiant HD 201889. Preliminary abundance analysis of G265-39 finds no abnormalities that suggest that the low Li content is associated with AGB mass transfer or deep mixing and pp-capture. We also detect line doubling in HIP 4754, heretofore classified as SB1.

Notes and References

This item contains 89 references.

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